Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Line Items]
Net income (loss)	$ (6,376)	$ 11,647
Weighted average shares:
Basic shares	41,241	40,207
Effect of dilutive securities—options and warrants outstanding	$ 0	$ 2,672
Diluted shares	41,241	42,879
Effect of dilutive securities:
Net income (loss) per share - Basic (in dollars per share)	$ (0.15)	$ 0.29
Net income (loss) per share - Diluted (in dollars per share)	$ (0.15)	$ 0.27